When making earphones with Etymotic, it’s hard to go wrong. It’s all about setting expectations, and setting them high. We wanted to make a pair of earphones that amazed all listeners—from audiophiles to newcomers, controlled listeners to commuters. To that end, we knew we needed something that felt as good as it sounded. With the EVO’s in-concha construction, the ERX has an ultra-streamlined, naturally contoured profile—great for on-stage or under-helmet listening. It’s also made from durable stainless steel, with a cable placement designed to reduce microphonics. Inside, the ER4XR’s single-balanced-armature design delivers excellent coherence across the entire frequency spectrum, eliminating the risk of the poorly-executed crossover between multiple drivers. We turned to Etymotic to handle the tuning on the ERX, landing on an accurate sound signature that adds weight to the lowest frequencies without encroaching on the upper bass and lower midrange. Moving up the spectrum, the mids and highs showcase stunning clarity and precision, mainstays in the Etymotic sound. From high to low—ER4XR to EVO—this is one IEM that covers it all.